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We report the discovery of a magnetic quantum critical transition in Mn[N(CN)(2)](2) that drives the system from a canted antiferromagnetic state to the fully polarized state with amplified magnetoelastic coupling as an intrinsic part of the process. The local lattice distortions, revealed through systematic phonon frequency shifts, suggest a combined MnN(6) octahedra distortion+counterrotation mechanism that reduces antiferromagnetic interactions and acts to accommodate the field-induced state. These findings deepen our understanding of magnetoelastic coupling near a magnetic quantum critical point and away from the static limit.

physical review letters

Quantum Critical Transition Amplifies Magnetoelastic Coupling in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Mn</mml:mi><mml:mo stretchy="false">[</mml:mo><mml:mi mathvariant="bold">N</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>CN</mml:mi><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mo stretchy="false">]</mml:mo><mml:mn>2</mml:mn></mml:msub></mml:math>

Quantum Critical Transition Amplifies Magnetoelastic Coupling inMn[N(CN)2]2